Solomon Marcus is an outstanding scientist and public speaker, with a tremendously diverse and intensive activity, with fundamental and many times pioneering contributions to mathematics, mathematical linguistics, formal language theory, semiotics, education, with an impressive international impact and recognition. Marcus wrote a paper together with Paul Erdős ("Sur la décomposition de l'espace euclidien en ensembles homogènes", Acta Math. Acad. Sci. Hungar 8 (1957), 443–452).
He has published about 50 books in Romanian, English, French, German, Italian, Spanish, Russian, Greek, Hungarian, Czech, Serbo-Croatian, and about 400 research articles in specialized journals in almost all European countries, in the United States, Canada, South America, Japan, India and New Zealand among others; he is cited by more than a thousand authors, including mathematicians, computer scientists, linguists, literary researchers, semioticians, anthropologists and philosophers.
He is recognizedas one of the initiators of mathematical linguistics and of mathematical poetics, and has been a member of the editorial board of tens of international scientific journals covering all his domains of interest.